WO2018149160A1 - Activation method utilized in electrically controlled common rail engine - Google Patents

Abstract

An activation method utilized in an electrically controlled common rail engine. The activation method comprises a fuel tank (1), a fuel pump (3) and a fine filter (4). A gas discharging device (6) discharging a fuel gas is arranged between the fuel pump (3) and the fine filter (4). An output port of the gas discharging device (6) communicates with the fuel tank (1) via an oil pipe. In the activation method utilized in an electrically controlled common rail engine, by arranging the gas discharging device (6) at an oil feeding port of a fine filter (4), air in the fine filter (4) can be discharged via the gas discharging device (6), thereby implementing active gas discharging, and effectively increasing activation performance of the engine.

Description

Electronically controlled common rail engine worry-free starting system Technical field

The invention relates to the field of engines, and in particular to a worry-free starting system for an electronically controlled common rail engine.

Background technique

In existing electronically controlled common rail engines, the fuel system is an important factor affecting its starting performance. At present, the existing common rail system mainly improves the starting performance of the engine by optimizing the system components and optimizing the layout of the whole machine. However, these methods cannot completely solve the problem of long starting time or failure to start; on some engines, by adding The installation of an electronic oil pump to speed up the exhaust of the oil circuit can achieve the purpose of speeding up the start-up and increase the cost of the whole machine. At the same time, it is not recognized in the prior art that the presence of gas on the starting performance of the oil pump to the fuel injection section.

Summary of the invention

It is an object of the present invention to provide an electronically controlled common rail engine worry-free starting system that can effectively improve the starting performance of the engine.

To achieve the object, an electronically controlled common rail engine worry-free starting system is provided, including a fuel tank, an oil pump, a fine filter and a fuel injection pump, and the oil passage between the oil pump outlet and the fuel injection port of the fuel injection pump An exhaust device for removing the oil gas is provided, and the outlet of the exhaust device communicates with the oil tank through the oil pipe.

Preferably, the venting device is a one-way valve.

Preferably, the one-way valve has an opening pressure of 1.5 bar to 6 bar.

Preferably, the exhaust device comprises a valve body, a valve body inlet provided at one end of the valve body, a vent hole provided at a side of the valve body, and an oil between the valve body inlet and the oil pump outlet port and the fine filter. Road connection, vent The oil pipe is connected to the oil tank, and the vent hole has a hole diameter of 0.2 mm to 3 mm.

Preferably, the pore diameter of the vent hole is initially determined according to the following formula and confirmed by test verification:

Where d is the diameter of the vent hole, P is the pressure inside the fine filter, V is the volume of the fine filter, a is the cross-sectional area of the vent, and v is the flow rate of the fuel.

Preferably, the venting means is disposed on the fine filter.

Preferably, the oil filter port end of the fine filter has a fixing seat, and the exhaust device is fixed to the fine filter through the fixing seat.

Compared with the prior art, the invention has the beneficial effects of:

The invention provides an active exhaust by effectively providing air in the fine filter through the exhaust device by providing an exhaust device at the oil inlet end of the fine filter, which can effectively improve the starting performance of the engine. Compared with the electronic fuel pumping scheme, the invention has the advantages of ingenious structure, high reliability, no additional control system and limited cost reduction; the invention can significantly speed up the starting speed of the engine compared with the electronic fuel pumpless scheme.

DRAWINGS

Figure 1 is a schematic view of the structure of the present invention;

Figure 2 is a block diagram showing the structure of the present invention;

Figure 3 is a flow chart of the method of the present invention;

Figure 4 is a schematic structural view of an exhaust device of the present invention;

Figure 5 is a schematic view showing the structural relationship between the fine filter and the exhaust device of the present invention.

detailed description

The invention is further described in the following with reference to the accompanying drawings, but without the limitation of the invention, the scope of the invention is limited by the scope of the invention.

As shown in FIG. 1 to FIG. 5, the present invention provides a worry-free starting system for an electronically controlled common rail engine, comprising a fuel tank 1, a prefilter 2, an oil pump 3, a fine filter 4, a fuel injection pump 5, and the fuel tank 1 passes through the oil pipe 7 In turn, it is connected with the prefilter 2, the oil pump 3, the fine filter 4, and the fuel injection pump 5. The oil return port of the fuel injection pump 5 is connected to the oil tank 1 through the oil pipe 7, and the oil pump 3 and the fuel injection pump 5 are provided with oil gas exclusion. An exhaust device 6 whose outlet is in communication with the oil tank 1 through a fuel pipe. The oil inlet 41 end of the fine filter 4 is provided with a fixing seat 42, and the exhaust device 6 is fixed to the fine filter 4 through the fixing seat 42.

In the present embodiment, the exhaust device 6 and the fixing base 42 are screwed to fix the exhaust device 6 to the fine filter 4, which can effectively avoid the influence of the vibration of the engine during normal operation on the exhaust device 6. The normal service life and stability of the exhaust device 6 are improved. In addition, the exhaust device 6 can also be connected to the two-stage connecting oil pipe 7 between the oil outlet of the oil pump 3 and the oil inlet of the fuel injection pump through a three-way joint.

The exhaust device 6 is a one-way valve. The exhaust device 6 includes a valve body 61, a valve body inlet 66 provided at one end of the valve body 61, and a vent hole 62 provided at a side surface of the valve body 61. The valve body inlet 66 communicates with the fixed seat 42, and the vent hole 62 passes through the oil pipe and The oil tank 1 is in communication, and the vent hole 62 has a hole diameter of 0.5 mm.

The pore diameter of the vent hole 62 is initially determined according to the following formula and confirmed by test verification:

Where d is the aperture of the venting opening 62, P is the pressure in the fine filter 4, V is the volume of the fine filter 4, a is the cross-sectional area of the venting opening 62, and v is the flow rate of the fuel.

In the present embodiment, the number of experiments before installation through the exhaust device 6 at the time of calculating the aperture of the vent hole 62 According to the above formula, the aperture of the vent hole 62 is preset, and then the experimental data measured by the installation of the venting device 6 is used to check the aperture of the vent hole 62 according to the above formula, so that the venting device 6 can ensure sufficient arranging. The gas capacity and the excessive fuel flow back to the tank 1 through the vent hole are not affected, so that the normal operation of the engine is not affected.

The check valve has a opening pressure of 5 bar. Furthermore, the opening pressure of the check valve can also be 1.5 bar or 2 bar or 3 bar or 4 bar or 6 bar.

Further, the diameter of the vent hole 62 may also be 0.2 mm or 0.7 mm or 1 mm or 1.5 mm or 2 mm or 3 mm.

The working process of the embodiment: after the engine is started, the fuel of the oil tank 1 is sequentially injected through the pre-filter 2, the oil pump 3, the fine filter 4 to the fuel injection pump 5 through the oil pipe 7, and the fine filter 4 has air to make the fine filter. 4 The internal pressure is increased to push the sealing steel ball 65 of the check valve 6 away, and the air and part of the fuel in the fine filter 4 enter the check valve 6 through the valve body inlet 66 and exhaust through the side of the valve body 61. The hole 62 is drained back into the oil tank 1 through the oil pipe 7; when the fine filter 4 air is discharged, the pressure is lower than the pressure of the pressure limiting spring 63 against the sealing steel ball 65, so that the sealing steel ball 65 is in contact with the valve body inlet 66, the check valve 6 The closing can reduce the air in the fine filter 4, thereby shortening the time of the next startup of the engine and achieving the purpose of smooth start.

The comparison between the present invention and the existing electronically controlled common rail engine starting system is as shown in Table 1.

Table 1

It can be seen from Table 1 that the starting time of the present invention is significantly and effectively shortened compared to the starting time of the existing electronically controlled common rail engine, and the starting performance of the engine can be effectively improved.

The above is only a preferred embodiment of the present invention, and it should be noted that those skilled in the art will recognize A number of variations and modifications may be made without departing from the structure of the invention, which will not affect the effect of the invention and the utility of the patent.

Claims (7)

An electronically controlled common rail engine worry-free starting system, comprising a fuel tank (1), an oil pump (3), a fine filter (4) and a fuel injection pump (5), characterized in that the oil pump (3) is oiled The oil passage between the port and the fuel inlet of the fuel injection pump (5) is provided with an exhaust device (6) for removing the oil gas, and the outlet of the exhaust device (6) is connected to the oil tank (1) through the oil pipe. A worry-free starting system for an electronically controlled common rail engine according to claim 1, wherein said exhaust device (6) is a one-way valve. The electronically controlled common rail engine worry-free starting system according to claim 2, characterized in that the opening pressure of the exhaust device (6) is 1.5 bar to 6 bar. A worry-free starting system for an electronically controlled common rail engine according to claim 2, wherein said exhausting device (6) comprises a valve body (61), and a valve body inlet provided at one end of the valve body (61) (66) an exhaust hole (62) provided on a side surface of the valve body (61), wherein the valve body inlet (66) communicates with an oil passage between the oil delivery port (3) oil outlet and the fine filter (4). The vent hole (62) communicates with the oil tank (1) through an oil pipe, and the vent hole (62) has a hole diameter of 0.2 mm to 3 mm. The worry-free starting system of the electronically controlled common rail engine according to claim 4, characterized in that the aperture of the exhaust hole (62) is initially determined according to the following formula and confirmed by test verification:

Where d is the aperture of the vent (62), P is the pressure in the fine filter (4), V is the volume of the fine filter (4), a is the cross-sectional area of the vent (62), and v is the fuel Flow rate. A worry-free starting system for an electronically controlled common rail engine according to claim 2, characterized in that said exhaust means (6) are arranged on the fine filter (4). The worry-free starting system of the electronically controlled common rail engine according to claim 6, characterized in that: the filter inlet (41) end of the filter seat of the fine filter (4) is provided with a fixing seat (42). The exhaust device (6) is fixed to the fine filter (4) through a fixing seat (42).

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